Question # 1

Which acid used for food preservation?

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H₂SO₄

HNO₃

HCl

CH₃COOH

In chemical reaction , the substances that combine are called.

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Reactants

Products

Equlibrium

Numerator

How many % age of nitrogen present in air by volume?

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70%

75%

78%

80%

A substance which can behave as an acid as well as a base is called.

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Acid

Base

Amphoteric

Neutral

pH of neutral solution is always.

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6

5

7

10

All water soluble metallic oxides have characteristic of:

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acidic

basic

neutral

amphoteric

Imperial chemical industries was established in.

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1942

1944

1950

1990

High concentration of which metal clogs the fish gills.

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Zinc

Aluminium

Sodium

Copper

The number of carbon atoms present in gasoline or petrol.

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5-10

6-10

7-10

8-10

The % age of carbon in coke is

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60

70

90

98

Which is not a poisonous gas?

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Ozone

Chlorine

Carbon di oxide

All of them

Which gas protects the Earth's surface from ultraviolet radiations?

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CO₂

CO

N₂

O₃

The percentage of ocean in world water is.

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50%

67%

97%

25%

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